Door lock



March 30, 19.54 E. L.. scHLAGE DOOR-LOCK.

INVENTOR.

- was ac. om?

3 Sheecs-Sheei'I l a..! 745.. OCDGGS Filed Aug. l0, 1948 film* March 30, 1954 E. l.. scHLAGE DOOR LOCK 5 Sheets-Sheet 2 Filed Aug. l0. 1948 INVENTOR. M i, 50m? March 3o, 1954 E SCHLAGE 2,673,758l

' DOOR LOOK Filed Aug. lO, 1948 Igan.

. I5 Sheets-Sheet 5 53 53@ n 1| r I l I. Ul] f ll Z5 5 2 8@ INVENTOR.

M al. @maga Patented Mar. 30, :1954

DOOR LOCK Ernest L. Schlage, Burlingame, Calif., assigner to Schlage Lock Company, a corporation Application August 10, 1948, Serial No. 43,471

4 Claims. l

This invention relates to a door lock, and especially to a reversible dead latching mechanism therefor.

The object of the present invention is generally to improve and simplify the construction and operation of dead latching mechanisms, and especially to provide a latching mechanism including a, main latch bolt and a cooperating dead latch both of which are reversible as a unit to permit either right or left hand installation of the lock and latching mechanism as a Whole in doors.

The invention is shown by way of illustration in the accompanying drawings in which:

Fig. 1 is a perspective View of the reversible latch bolt unit;

Fig. 2 is a perspective View of the latch bolt actuating unit;

Fig. 3 is a perspective view of the retractor bar;

Fig. 4 is a perspective view of the retractor bar hinge block;

Fig. 5 is a vertical longitudinal section showing the lock mounted in a door and with the door in closed position, said view showing the main latch bolt engaged with the striker plate on the door jamb, and the dog on the inner end of the retractor bar ready to engage the shoulder on the anchor plate; y

Fig. 6 is a sectional View similar to Fig. 5, but taken at right angles thereto, said View showing the dead locking bolt depressed by the striker plate;

Fig. 7 is a sectional View similar to Fig. 5, but with the door inl open position and the main latch bolt extended;

Fig. 8 is a sectional view similar to Fig. 7, but taken at right angles thereto and showing both bolts extended.

Fig. 9 is a perspective view of the main latch bolt;

Fig. 10 is a perspective view of a retainer plate which is applied to the main latch bolt;

Fig. 11 is a perspective view of the main latch bolt pin;

Fig. 12 is a vertical cross-section taken on lines XII- XII of Fig. 5, and in the direction of the arrows;

Fig. 13 is a vertical cross-section taken on lines XIII- XIII of Fig. 5, and in the direction of the arrows;

Fig. 14 is a vertical cross-section taken on lines XIV- XIV of Fig. 5, and in the direction of the arrows;

Fig. 15 is a perspective view of a sleeve which cooperates with the dead locking boltl and Fig. 16 is a perspective view of the same sleeve,

2 but looking at the end opposite that shown in Fig. 15.

In the customary installation, a door latch actuating unit A is inserted in a hole 2 drilled transversely of a door C, and a latch bolt unit B is inserted in a hole 2 drilled at right angles to the hole 2 through the edge of the door and interengages the unit B. A key 5, see Figure 12, is inserted in the unit A from the exterior of the door and actuates a flat spindle bar 4, which in turn actuates the latch bolt mechanism. The spindle bar may also be rotated by a knob 5 or turnpiece disposed on the inside of the door. The unit A is provided with a pair of anchor posts I and an escutcheon plate 9. Screws 8 pass through a thumb piece escutcheon I0, see Figure 8, and secure the unit A in the transverse hole 2 of the door. The unit B includes a face plate I I secured to the edge of the door by screws I2.

Extending from the face plate I I is cylindrical latch bolt housing I4 from the rear end of which projects a double anchor plate I5. This double plate has central openings formed therein in which is journalled a crank arm I6 actuated by the spindle bar 4 which extends through a slotlike opening 4a therein. The anchor plate I5 is also provided with a pair of openings Il, see Figure 1, one at each end to receive the anchor posts 1 of the unit A.

When assembling the lock in a door the unit B is first inserted in the hole 3, and when so inserted, the anchor plate I5 projects into the transverse hole 2. The unit A is then inserted in the hole 2 and as it is inserted, the posts I pass through the openings I1 in the anchor plate and the spindle bar 4 passes through the opening 4a in the crank arm I6. The escutcheon plate I9, which carries the turnpiece 8, is then applied and the screws 8 are inserted and tightened. Finally screws` I2 are fastened and both units are secured in place and are interlocked with each other.

Included in the unit B is a main latch bolt 20 indirectly coupled to the inner end of which is a retractor bar 2 I, see Figures 3, 5, and 6. The revtractor bar 2I projects through the inner end Ida of the housing I4, see Figure l. It is channel shaped in cross-section to provide a pair of depending side Walls contoured to form a pair of cams 22. The crank arm I6 carries a pin IGa at its outer end and this extends through an enlarged opening Itb formed in the inner end of the retractor bar 4 in the direction of arrow a, see Figure 5. The pin Ilia engages the retractor bar and retracts it together with the main latch bolt 20 indirectly connected to the outer end thereof.

When the spindle bar 4 is released, the latch bolt and the retractor bar assume a normal or projected position as they are at all times acted upon by a spring 23.

Formed on the inner end of the channeled retractor bar 2| are dogs 25 positioned under certain conditions to engage shoulders 28 formed on the double anchor plate I, and when such engagement is made, the main latch bolt 26 is dead locked. The clogs are actuated into and out of the path of the shoulders 25 by the cams 22 and by a cup 21, see Figures 5, 6, 15 and 16', slidably mounted Within the latch bolt housing. The cup 21 is in turn actuated by a dead locking bolt 26a which is preferably a round bar or pin having one flat side 2Gb to contact a flat face 2Go of the main latch bolt 2B. The inner end of the dead locking bolt 20a has a grooved head 20d formed thereon and this extends into an arcuate slot 28 formed in the closed end of the cup 21. The slot extends slightly more than 180 degrees and has a cut away portion 28a to permit introduction of the grooved head 26d. The closed end of the cup 21, see Figures 15 and 16, is provided with a central opening 25 and has a rectangular notch 36 to provide a guide for the retractor arm. An adjacent portion 3| of the cup 21 is cut away and a portion 32 is attened to engage the cams 22 of the retractor bar.

Suitably secured in the central opening 29 of the cup 21 is a hub 33 which supports and guides a spring 24. This spring normally maintains the cup 21 and the dead locking bolt 23a in a projected position as shown in Figures 7 and 8. In this position the flattened portion 32 of the cup engages the cams 22 of the retractor bar and elevates the inner end of the bar to a position where the dogs 25 ride above the shoulders 26, thus leaving the main bolt 26 and the dead lockingr bolt Za free to be depressed for example when the door is being closed. When the door is fully closed as shown in Figures and 6, the main latch bolt 2-3 assumes a projected position and the dead locking bolt 20a, assumes a depressed position against the strike plate 5B. The flattened portion 32 on the cup assumes a position out of engagement with the cams 22 and the dogs 25 drop into a position to engage the shoulders 25, thus preventing a depression of the main latch bolt or dead locking the same.

The retractor bar 2| is pivotly secured to a loose block 39 by a pin 34 in order to provide a fulerum to permit elevation or lowering of the dog 25 with relation to the shoulder 26. The pivoted. end of the retractor bar is shaped to forni a forked bell-crank 35, see Figures 3 and 5, so that it will straddle a pin This pin is carried coaxially by the main latch bolt 26 and is retained against removal therefrom by a plate 31 which is secured by staking or anging in a sleeve-like extension 3S formed at the rear end .of the main latch bolt. The pin 36 has two collars 36a and 36h formed thereon to limit the endwise movement of the pin with relation to the main latch bolt to an amount just suilicient to permit free swinging movement of the bell-crank 35. rlhe collar 3617 engages the bell-crank and is held in such engagement by the spring 23. rIhe pin 36 serves two main functions, iirst, that of a guide and retainer for the springr 23 and second, that of directing the spring pressure to the bell-crank, so that the dogs 25 on the inner end of the retractor bar are urged in a downward or engaged position with relation to the shoulders 2G. The spring 23 similarly serves two main functions, rst, that of urging the cup 21 outwardly normally to maintain the dead locking bolt in extended position and second, that of urging the cams 22 to elevate the dogs 25.

To accomplish reversability of the main and cooperating dead locking bolts as a unit to permit either right or left hand installation of the lock in doors, the outer face plate is backed by an inner plate a, the plates being secured together by riveted portions IIb. The latch bolt housing |4 is provided at its outer end with an annular flange extending between the outer and inner plates and Ila to form a swivel permitting the face plate and the inner plate ||a to be rotated about the outer end of the latch bolt housing. As the face plate has a non-circular opening therein tting the contour of the main latch bolt 20 and the dead locking bolt 20a, these bolts must rotate with the face plate and the inner plate I la when they are rotated about the axis of the latch bolt housing.

As the retractor bar is held against rotation with relation to the latch bolt housing I4 because it engages the crank arm I6 the main latch bolt 26 rotates with relation to the retractor bar. ln all positions of rotation a floating pivotal support is provided by the hinge block 39, see Figures 3, 4 and 5. This block has a hole 34a to receive the pivot pin 34 and has upper and lower nat edges 4|! and 4| formed thereon. The lower ilat edge il rests on the pin 35 and the upper at edge loosely engages the inner surface of the sleeve-like extension 38 formed on the latch bolt. The block 39 is accordingly held between the sleeve 3B and the pin 36 no matter how the sleeve 38 of the main latch bolt 20 is rotated about it.

A rotatingr connection is also formed between the dead locking bolt and the cup 21, the cup 21 being held against rotation by the portion thereofV that straddles and forms a guide for the retractor bar. As shown in Figures 12, l5 and 16, the rectangular shaped notch 3i! formed in the end of the sleeve 21 provides a pair of guide shoulders 30a engaging the opposite sides of the retractor bar. The grooved head 2M of the dead locking bolt extends into the arcuate slot 28 and interlocks therewith. The extent of the slot 28 is such that it is possible to rotate the dead locking bolt through degrees with relation to the cup 21. A rotation of half is all that is necessary as only a half turn of the inain and the dead locking bolts is required to change them from right hand to left hand position, or vice versa.

The cup 21 is'actuated by the spring 25. and the dead locking bolt 26a. The spring 24 is guided throughout its movement by a hub 33 on thecup and by a hub 33a secured to a disc pressed against the inner end of the latch bolt housing. The dead locking bolt when depressed moves the cup 21 against the spring 2e to assume an innermost position as shown in Figure 5. The dead locking bolt is depressed or moved inwardly in unison with the main latch bolt 2; by abutment of the sleeve 38 with the cup 21 when the latch bolt engages and cams over a striker plate 5G as shown in Figures 5 and 6, for instance when closingthc door. The dead locking bolt is held depressed by the striker plate 55 as long as the door is closed since there is no opening in the striker plate for the dead locking bolt to extend into. Therefore, while both bolts are depressed when the main bolt is in engagement with the striker plate 50, only the main latch bolt 2|l'can again project through a striker plate opening 5| havingthe movement to the crank arm I6 in the direction of the arrow a, see Figure 5, causing the crank pin ifa to engage the inner end of the retractor bar through the enlarged opening Ib and raise the dogs free of the shoulders 29. Further rotation of the crank arm I6 retracts the main latch bolt 20 from the striker plate 5G thus permitting opening of the door. When the key mechanism 5 or the turn piece 6 is released, springs 23 and 2f! restore all parts to normal position and profect both the main latch bolt and the dead locking bolt.

While the latch bolt housing It, the retractor bar 2l and the cup 2l are non-rotatable, both of the bolts 2B and 20a and the face plate l l and the inner plate Ila are rotatable with relation to these members. By providing for such relative rotation, the same lock structure may be applied to either right hand or left hand doors.

Having thus described my invention, what I claim and desire to secure by Letters Patentis 1. In a lock structure, a horsing having a circular portion, a face plate mounted on said portion and adapted to be swung relative to said housing about an axis to positions 180 degrees apart, said face plate being provided with a noncircular aperture, a bolt mounted in said housing for oscillation to positions 180 degrees apart and axially reciprocable with respect to said housing, a portion of the cross section of said bolt being formed complementarily to a portion of said aperture to prevent swinging said bolt relative to said face plate, a retractor bar mounted in said housing for axial movement relative to said housing, means constraining said retraetor bar against rotation relative to said housing about said axis, a block hingedly connected to said retractor bar at one end of the latter and slidably engaging said bolt to permit oscillation of the latter relative to said bar.

2. In a lock structure, a bolt adapted to be reciprocated along an axis, said bolt being provided with a recess opening axially outwardly thereof, an elongated axially extending pin projecting from said bolt through said recess, a collar on said pin spaced from said bolt, an elongated retractor bar extending substantially parallel to said axis for so reciprocating said bolt and having one end disposed in said recess, a forked bell crank on said one end straddling said pin ata point between said bolt and said collar and. in

engagement with said collar, a block slidably engaging the side wall of said recess and hingedly secured to said one end of said bar to permit oscillation of said bolt about said axis relative to said bar and to permit tilting of said bar relative to said block to different angles of inclination relative to said axis.

3. In a locking structure, an elongated housing having a cylindrical end, a face plate apertured to receive a latch bolt and a dead locking bolt therethrough, said aperture being non-circular and complementarily :formed relative to the combined cross sections of said bolts, said face plate being swingably received on said cylindrical end for swinging with said bolts about the axis of said housing to positions degrees apart relative to said axis for securement to left or right hand doors, means on said face plate for securing the same to a door in one of said positions, said bolts being reciprocably supported in said housing in either one of said positions, an elongated retractor bar for moving said bolt and extending generally parallel to said axis and ti`table reative to said axis between dogging and undogging positions, a block slidably engaging said latch bolt and hingely secured to one end of said bar to permit said swinging of said bolt relative to said axis and to permit said tilting of the bar relative to said axis, a cup slidably supported in said housing and engageable with said bar for tilting the same to undogging position, spring means urging said bar to dogging position at all times. said cup being provided with an arcuate slot concentric with said axis, said dead locking bolt being provided with a reduced portion loosely received in said s'ot to permit swinging said dead locking bolt between said positions when said cup is stationary.

4. In a lock structure, an elongated housing having a cylindrical end, a face plate apertured to receive a latch bolt and a dead locking bolt therethrough, said aperture being non-circular and complementarily formed relative to the combined cross sections of said bolts, said face plate being swingably received on said cylindrical end for swinging with said bolts about the axis of said housing to positions 180 degrees apart relative to said axis for securement to left or right hand doors, means on said face plate for securing the same to a door in one of said positions, said bolts being reciprocably supported in said housing in either one of said positions, an elongated retractor bar for moving said bolt and extending generally parallel to said axis and tiltable relative to said axis between clogging and undogging positions, a block slidably engaging said latch bolt and hingedly secured to one end of said bar to permit said swinging of said bolt relative to said axis and to permit said tilting of the bar relative to said axis, a cup slidably supported in said housing and engageable with said bar for tilting the same to undogging position, spring means urging said bar to clogging position at all times, said cup being provided with an arcuate slot concentric with said axis, said dead locking bolt being provided with a reduced portion loosely received in said slot to permit swinging said dead locking bolt between said positions when said cup is stationary, said cup being provided with an axially extending groove for receiving said retractor bar therein to prevent relative rotation between said cup and said bar.

ERNEST L. SCHLAGE.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,148,549 Sparks Aug. 3, 1915 1,739,654 Schlage Dec. 17. 1929 1,876,080 schlage Sept. 6, 1932 2,390,756 Voight Dec. 11, 1945 2,516,991 Heyer Aug. 1, 1950 

